Running Windows Vista Business x86 and x64, this occurs on both platforms. When I go to the "Data Execution Prevention" tab in system properties - performance options, all thesettings that can be changed are all grayed out. It then indorms me: To use these settings, you must be a computer administrator and you must use the bcdedit.exe file. Screenshot: http://img452.imageshack.us/img452/7967/depproblemcx4cg1.jpg I am the administrator (using the built in admin account), now I know how to toggle DEP on and foff via the command line but is there any commands to toggle the status of DEP for specific applications, or better still any ideas on how I can retrieve the settings functionality back? Its really annoying as I have to now turn DEP off completley otherise many applicatiosn simply do not work.

Ive managed to fix it, I found another command to use which none of the sites seem to tell you when telling you how to enable/disable via the command line. When enabling: bcdedit.exe /set {current} nx AlwaysOnbcdedit.exe /set {current} nx optin When disabling: bcdedit.exe /set {current} nx AlwaysOff Then restart! This has worked for x64 and x86, thanks for the members who viewed the thread though.

Excellent piece of information. Not available anywhere in the web. Great service. Thanks.